Behavior of Concrete-Filled Steel Tubular Beam With Partial Replacement of Demolition Waste as a Coa

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BEHAVIOR OF CONCRETE-FILLED STEEL TUBULAR BEAM WITH PARTIAL REPLACEMENT OF DEMOLITION WASTE AS A COARSE AGGREGATE Khaja Mohiuddin1, R Sankar2 1M.Tech

Construction Technology, VTU Belgaum(khajamohiuddin013@gmail.com) 2 M.Tech Infrastructure Engineering, JNTU Hyderabad

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Investigation of flexural properties of concrete filled steel tube with partial replacement of coarse aggregate for M30 grade of concrete with proportion of 1: 1.70: 3.09 with w/c ratio of 0.40 with 28 days of curing. This chapter discus importance of concrete filled steel tube beam its application and experimental reason that has made the use of these structural material so widely used in the world today. The paper shows the use of concrete filled steel tube beam with partial replacement of coarse aggregate with 10% and 30% under loading In this paper an attempt has been made using recycled aggregate instead of convention aggregate the advantage of using such construction waste material provided a low cost of construction effective waste management technique. In order to reduce the cost and its bond strength with the recycled coarse aggregate concrete and steel in order to reduce the cost and improve the overall strength of the structure

deflection is lesser in this type of beam when compared with steel beams. CSFT posses high ductility high strength and hence this are widely used in engineering project and attempt has been made to study the behavior of csft beam in loading. Many studies shows that the csft elements are affected due to their concrete core and Poisson ratio .The steel tube has a confining effect as its Poisson ratio is lower than concrete. The recycled aggregate utilizes demolition material from concrete structure or concrete burnt clay brick masonry as construction aggregate use of this type of coarse recycled aggregate avoid problem of wastage and also reduces the demand of natural granite aggregate.

The use of recycling aggregate obtain from construction and demolition waste has been long recognized and it has a potential aspect of concave natural resource and also to reduced the overall cost used in production. Studies shows that demolition waste has lower bulk density and higher water absorption the undesirable effects of recycled aggregate or concrete quality limit the use of the material in structural concrete and hence the partial replacement of 10% to 30% is carried on the study CFST beam with M 30 grade of concrete with axial load for its ultimate loading capacity at 28days of curing. All the specimens made in this research are tested with properties of fresh and hardened concrete and consequently with the behavior of beam subjected to deflection, up to 30% replacement of natural coarse aggregate with recycled coarse aggregate and its interaction with CSFT is taken into consideration in this paper .The prime reason of use of steel tube is that it provides a sufficient effect to concrete with respect to its confining action and also steel tube this acts as a longitudinal and transverse reinforcement. Several research work has been carried on with respect to the behavior of CSFT with cross-sectional thicknesses and steel material [1-2]. It was shown that CFST improves the compression behavior .The flexure behavior of CFST has recently got the attention of researchers to study the feasibility of utilizing as this has advantage to overcome the limitation than that of plain normal concrete [3-5].Concrete is confined in steel tube and the steel tube yields before the concrete crush this reduces the local bulking [3-5]. Han tested 16 CFST beams with square and

All the specimens which are made in this research are tested with properties of fresh and hardened concrete with the behavior of beam subjected to bending and recycled coarse aggregate is obtained from demolishing waste concrete with and are also tested for their properties as per IS specification Key Words: Composite beam, steel tubular sections, replacement coarse aggregate, normal concrete

1. INTRODUCTION The basic reason for the use of concrete filled steel tube is its composite as concrete is strong in compression and steel is strong in tension with this composite action the advantage of both concrete and steel can be utilized and hence Concrete filled steel tubes (CFST) beam are consider for research. They are used in high-rise building and low-rise industrial building.

They are different type of steel tube shape like square, circular and rectangular. This type of composite beam can cover a large space without any intermediate columns and also the

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rectangular cross-sections to study their flexural behavior [3].

The concrete cube strength for these CFST beams ranged from 27 MPa to 40 MPa, and steel yield strength from 294 MPa to 330 MPa.

1.1 experimental programs

Material used

RESEARCH SCOPE

The Portland cement with 53 grade was used for preparation of test specimen

To study the strength and ultimate load carrying capacity of CSFT beam made with recycled aggregate after investigating the compressive and split tensile and flexural behavior of recycled aggregate are discussed in paper.

Specific gravity =3.15 Fine aggregate



Thickness of Steel tube (t) mm – 6



Length of beam (mm)- 700mm

1.2 Test set up and procedure

Natural river sand confirming to zone III of IS: 3831970 TABLE 3

In total 9cube, 9 cylinder and 9prism specimen are casted and tested for their compressive, split tensile and

Specific gravity =2.65

flexural strength. The following size of standard specimen

Natural coarse aggregate

where used for research cube moulds (150x150x150)mm , cylinder mould of size (150x300)mm ,prism mould of size

Crushed granite aggregate with 20mm minimum size are used.     

(100x100x500)mm. The mould have been cleared of dust particles and applied with mineral oil and the specimen are

With specific gravity of 2.79 Water absorption 1.5% Bulk density 1779 kg/m3 Fineness modulus 6.7 Crushing strength 20.2%

cured for 28 days for present work. The cube specimen where placed over compression testing machine of capacity 200 tones. The test is carried out by placing cylindrical specimen horizontal between the loading surface of testing machine. And

Recycled coarse aggregate

the load is applied until the failure of cylinder specimen along

Recycled coarse aggregate is obtained by crushing with a nominal size of 20mm are used and properties of recycled aggregate is tested and given below

the vertical diameter so that the specimen can be subjected to horizontal stress. Prism mould of size (100x100x500)mm is tested using universal testing machine. The machine with two

 With specific gravity of 2.73

line spaced at 133.3 mm apart the load shall be applied on the

 Water absorption 1.4%

prisms which are placed above the rollers with bearing of 50mm from each support.

 Bulk density 1703 kg/m3  Crushing strength 17.03%

The hallow steel tubular beam and other composite beam specimen are tested in universal test machine. The load is

Water Portable water available in laboratory are used for mixing and curing for concrete specimen.

150mm diameter and 700mm in length the specimen are

Square steel tube

classified in different set of groups. For cube cylinder and



Outer Diameter(mm)- 120



Inner Diameter(mm)- 140.6

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used for recording the defection of beam. The load is applied at uniform rate. A total of 8 specimen are casted the beam of

Physical properties of steel tube used

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applied with help of hydraulic jack, at the center a dial gauge is

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prism a total of 3set where casted which consist of 3specimen each and for beam specimen a total of 4set are casted which

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consists of 2 specimen each .The first set represented by ‘S ’of hollow square reference beam, second set represented by ‘SP’

Beam-S

Beam-SP

Beam-SP10%

Beam-SP30%

of steel tube beam infill with concrete and third set represented by ‘SP-10’ with 10% partial replacement of coarse

Deflection

Load

Defle ction

Load

Defle ction

Load

Defle ction

Load

(mm)

(KN)

(mm)

(KN)

(mm)

(KN)

(mm)

(KN)

0

0

0

0

0

0

0

0

0.55

20

0.43

20

0.51

20

0.81

20

0.63

40

0.57

40

0.62

40

1.13

40

aggregate and ‘SP-30’ with 30% partial replacement of coarse aggregate

Concrete Specimen

No of Testing Specimens

Notation

Avg Strength

S

NA

NA

0.71

60

0.64

60

0.71

60

1.68

60

Sp

3

28.09

0.93

80

0.78

80

0.84

80

1.97

80

Sp-30

3

27.68

1.07

100

0.97

100

1.03

100

2.21

100

Sp-60

3

26.11 1.29

129.31*

1.12

150

1.33

150

2.56

150

S

NA

NA 1.51

164

1.51

200

1.61

200

2.83

200

Sp

3

3.33

Sp-30

3

3.25

2.01

171

1.87

250

1.94

250

3.04

250

Sp-60

3

3.19

2.49

190.64**

2.17

288.3*

2.34

270.17*

3.44

270

S

NA

NA 2.34

300

3.01

300

3.76

277.74*

Sp

3

2.72

Sp-30

3

2.69 2.79

310

3.34

310

4.03

300

Sp-60

3

2.61

3.31

330.7* *

3.61

321.63**

4.37

310

4.56

316.57**

Cubes

Cylinder

Prism

Table-1: Results for Compressive split tensile, flexural strength for 28 days of curing (Avg of 3 Specimens)

BEAM TYPE

MODEL SIZE THICKNES(t) (BxDxL) mm

Steel strength

d/t ratio

Ultimate load

Fy (Mpa)

S

150x150x700

6

350

25

190.64

SP

150x150x700

6

350

25

330.41

Table 3 :Load Carrying Capacity of Specimen with deflection *First

crack Crack

** Ultimate SP-10%

150x150x700

6

350

25

321.63

SP-30%

150x150x700

6

350

25

316.57

Table: 2 Result of beam model with ultimate load carrying capacity

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Table 3: Load vs. Deflection

Crack Behavior of Specimen After Application of tensile load for 28 days

Freshly Prepared Specimen

Crack Behavior of Specimen After Application of Flexural load for 28 days

3. CONCLUSIONS It can be concluded that the use of recycled aggregate up to 30% in CFST have similar strength when compared with that of normal plain reinforced beam. Crack behavior is at the lower end of beam specimen when tested under loading with increase in percentage variation of recycled aggregate the strength and ultimate load bearing capacity of CSFT beam is decreased but this decrease in strength and load bearing capacity can be enhanced by more advance and sophisticated treatment of recycled aggregate method. The ultimate load of steel tubular

Specimens under Curing Process

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beam infill with normal concrete(SP) has about 42.30% increase than that of hollow tubular reference beam(S) and the percentage decrease of partially replaced coarse aggregate with infill normal concrete(SP) is about 2.73%, 4.37% for (SP10) and (SP-30).

REFERENCES [1] F. Abed, M. AlHamaydeh, and S. Abdalla, Experimental and numerical investigations of the compressive behavior of concrete filled steel tubes (CFSTs). Journal of Constructional Steel Research 80, 429-439, 2013.

[2] S. Abdalla, F. Abed, and M. AlHamaydeh, Behavior of CFSTs and CCFSTs under quasi-static axial compression.

Journal of Constructional Steel Research 90, 235-244, 2013.

[3] L-H. Han, Flexural behavior of concrete-filled steel tubes.

Journal of Constructional Steel Research 60, 313-337, 2004.

[4] AISC Specification for structural steel buildings. AISC, Chicago, IL: American Institute of Steel Construction, 2010

BIOGRAPHIES

1’st Author Photo

Author Photo

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Khaja Mohiuddin received B.E Civil KBN College of Engineering Gulbarga, Karnataka, India, and M.Tech in Construction Technology from VTU Belgaum, Karnataka.

R SANKAR received his B TECH Civil Engineering degree from VVIT, Hyderabad and M Tech in Infrastructure from LIET Hyderabad. He is presently working as Asst Prof in Civil Engineering Dept, Nawab Shah Alam Khan College of Engineering and technology, Hyderabad, Telangana, India.

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